thanks for the follow up.
Just cause I'm a type the only way to be a 100% sure the box is bad is to reinstall it and see IF the problem returns. Sorry but my years in R&D required back to back testing (sometimes more than once) to confirm results especially for the German VP I reported to.
however there was a problem with a Autometer digital pot scrubbing speedometer that would not calibrate several years back that we chased for 50 hours (or more). I even had a sillyscope on the signal. We did what your not supposed to and changed 3 or 4 things at once and it magically started working. UHH I didn't backtrack on that one